Abstract
Low temperature, infrared absorption spectra of gadolinium gallium garnet crystals doped with Ce are presented. In the region of intraconfigurational 4-4 transitions the spectra exhibit existence of at least two different, major Ce related centers in the GGG crystals and also some other centers at lower concentration. The spectrum of 4-4 intrashell transitions of Ce ions extends up to about 3700 cm due to the large splitting of the excited state. In the visible region the absorption spectrum shows influence of symmetry-related selection rules. The absorption coefficient changes in the region of 4-5 transitions due to thermal population of the second level, belonging to the ground state. This suggests that the symmetry of the site occupied by Ce ions, which substitute Gd, is higher than expected for garnet hosts.
- Received 20 August 2012
DOI:https://doi.org/10.1103/PhysRevB.87.045114
©2013 American Physical Society